| http://www.w3.org/ns/prov#value | - Viagra's mean half life is about 4 hours.If you are going to take any of the PDE5 inhibitors such as Viagra, it is very important that your doctor be aware if you have a liver condition (such as cirrhosis) or kidney condition (such as if you are on dialysis) because you may need a special dosage adjustment.Likewise, if you try to obtain Viagra on the internet, please make sure that the person auth
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